I consider myself very lucky because I have a good relationship with my in-laws so usually if I get really tired for the week and need to unwind on the weekend I just dump the kids at their gramps place and both parties will be happy.
Idk how people do it. I've gotten so used to the job I have now where I work 40hrs on the weekends (Friday, Saturday, Sunday) and I'm off all week. Sometimes the weeks still feel short
Downsides: rotating schedule, 10 hour days occasionally require working 5-6 days in a row pending when people take time off. We set it up so there are overlap on a schedule in the evening though, so you also have to work a abnormal shift ~4 times every two months.
I'd still prefer it over 8x5s. Those long weekends are glorious.
When I'm working on a project that is mine and has my name on it, and I think that it'll help me or someone else in a meaningful way, I'll happily lose sleep over perfecting it.
When I'm just a cog in a giant faceless machine that wants only to maximize profits, I don't really care what the hell happens with the product as long as I get paid.